SCImago is a public portal which gives access to key journal metrics derived from Scopus data, such as
SJR (SCImago Journal Rank)
H-index (the number [h] of articles in a journal that have received at least [h] citations over the time period.
SCImago is searchable by journal or by country of publication.
Search by subject area or subject category. There are 313 subject categories in total, under 27 major thematic categories, according to Scopus Classification.